Psychosis
Medical mimics
endocrine
thyroid disease
Cushings
insulinoma - confusion and bizarre behaviour
phaeochromocytoma - episodic anxiety is characteristic
Metabolic
Acute intermittent porphyria
Autoimmune
Systemic Lupus erythematosus
Hashimoto enceophalopathy
paraneoplastic limbic encephalopathy - autoantibodies are causal in producing psychosis
References include:
https://www.psychiatrictimes.com/view/differential-diagnosis-psychotic-symptoms-medical-mimics